Date: Sat, 28 Apr 2007 19:11:50 GMT From: Jan Schaumann<jschauma@netmeister.org> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/112212: touch(1)ing a directory and failing yields return code 0 Message-ID: <200704281911.l3SJBoLT048085@www.freebsd.org> Resent-Message-ID: <200704281920.l3SJK4oL050751@freefall.freebsd.org>
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>Number: 112212 >Category: misc >Synopsis: touch(1)ing a directory and failing yields return code 0 >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Apr 28 19:20:04 GMT 2007 >Closed-Date: >Last-Modified: >Originator: Jan Schaumann >Release: >Organization: >Environment: >Description: When using touch(1) on a directory that I can't update the timestamp on (say, if the filesystem is mounted read-only), it will return 0 as the return value, even though it failed. The reason this happens is in touch.c#225: /* Try reading/writing. */ if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode) && rw(*argv, &sb, fflag)) rval = 1; else warn("%s", *argv); At this point, it tries to update the timestamp using utimes(2), which failed, so it would continue to try to update it by reading and writing the file. However, since the file in question is a directory, it doesn't try this and simply warns instead of setting the return value to 1. >How-To-Repeat: $ mkdir foo $ touch foo/bar $ mount -u -o ro / $ touch foo/bar touch: foo/bar: Read-only file system $ echo $? 1 $ touch foo touch: foo: Read-only file system $ echo $? 0 $ >Fix: See NetBSD's touch(1): /* Try reading/writing. */ if (!S_ISLNK(sb.st_mode) && rw(*argv, &sb, fflag)) rval = 1; This still is slightly suboptimal, since the error message will be $ touch foo touch: foo: Is a directory $ echo $? 1 $ But that's better than returning 0. >Release-Note: >Audit-Trail: >Unformatted:
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